// Copyright (c) 2023 Presto Labs Pte. Ltd.
// Author: fengyang

#pragma once

#include <map>
#include <string>
#include <vector>

#include "coin2/exchange/base/executor_util/market_ts.h"
#include "coin2/exchange/base/feed/processor.h"
#include "coin2/exchange/bit/symbology/product.h"

namespace coin2::exchange::maicoin::feed_v2 {
namespace impl {

using coin2::exchange::feed::WebsocketConfig;

class MaicoinRequestGenerator : public base::feed::RequestGenerator {
 public:
  explicit MaicoinRequestGenerator(const WebsocketConfig* ws_config)
      : config_(ws_config) {}

  std::vector<std::string> GenerateRequests(
    const std::vector<std::string>& channels,
    const std::vector<std::string>& symbols,
    const std::map<std::string, std::string>& channel_templates,
    const std::string& request_template) override {
    std::vector<std::string> reqs;
    std::vector<std::string> ch = channels;

    // kline
    std::vector<std::string> ch_kline;
    auto iter = ch.begin();
    while (iter != ch.end()) {
      if (StringStartsWith(*iter, "kline_rest")) {
        ch_kline.push_back(*iter);
        iter = ch.erase(iter);
      } else {
        iter++;
      }
    }

    auto timestamp = MarketTimestampProvider::GetTimestamp();
    if (!ch_kline.empty()) {
      boost::posix_time::ptime round_time = TimestampRoundHour(timestamp);
      for (auto& symbol : symbols) {
        for (auto& ch_k : ch_kline) {
          std::string c = channel_templates.at(ch_k);
          auto interval_time = GetInterval(c);
          std::vector<std::pair<int64_t, int64_t>> durations;
          bool long_query = base::feed::RequestGenerator::CheckLongQuery(
              round_time, symbol, ch_k, &last_long_query_time_);
          if (long_query) {
            durations = base::feed::RequestGenerator::GetDurations(
                config_->kline_length(), config_->kline_start(), config_->kline_end(),
                interval_time, 30);
          } else {
            // query small data
            durations = base::feed::RequestGenerator::GetDurations(
                "3", "", "",interval_time, 30);
          }

          for (const auto& d : durations) {
            std::string c_copy = c;
            // rest api symbol is upper
            boost::replace_all(c_copy, "{}", symbol);
            boost::replace_all(c_copy, "{start}", std::to_string(d.first / 1'000'000'000LL));
            reqs.emplace_back(c_copy);
          }
        }
      }
    }

    if (request_template.find("{json_list}") != std::string::npos) {
      for (const auto& symbol : symbols) {
        nlohmann::json j;
        for (const auto& channel_name : channels) {
          std::string c = channel_templates.at(channel_name);
          boost::replace_all(c, "{}", symbol);
          j.push_back(nlohmann::json::parse(c));
        }
        if (j.empty()) continue;
        std::string s = request_template;
        std::string json_list = j.dump();
        boost::replace_all(s, "{json_list}", json_list);
        reqs.push_back(s);
      }
    } else {
      std::vector<std::string> reqs_others = RequestGenerator::GenerateRequests(
          ch, symbols, channel_templates, request_template);
      reqs.insert(reqs.end(), reqs_others.begin(), reqs_others.end());
    }

    return reqs;
  }

 private:
  int64_t GetInterval(const std::string& channel) {
    if (channel.find("period=1&") != std::string::npos) {
      return (int64_t)60 * 1'000'000'000;
    } else if (channel.find("period=5&") != std::string::npos) {
      return (int64_t)300 * 1'000'000'000;
    } else if (channel.find("period=15&") != std::string::npos) {
       return (int64_t)900 * 1'000'000'000;
    } else if (channel.find("period=60&") != std::string::npos) {
      return (int64_t) 60 * 60 * 1'000'000'000;
    }  else if (channel.find("period=1440&") != std::string::npos) {
      return (int64_t)24 * 60 * 60 * 1'000'000'000;
    } else {
      THROW() << "Not support new channel: " << channel;
    }

    return std::numeric_limits<int64_t>::quiet_NaN();
  }

  const WebsocketConfig* config_;
};

}  // namespace impl
using impl::MaicoinRequestGenerator;
}  // namespace coin2::exchange::maicoin::feed_v2
